(Mishnah): If one is Mudar Hana'ah from 'those who cease on Shabbos or from those who eat garlic', he may not benefit from Yisraelim nor from Kusim;

From 'those who ascend to Yerushalayim on the festivals', he is forbidden from Yisrael, and permitted from Kusim.

'I will not benefit from Bnei Noach', he may benefit from Yisraelim, but not from [other] nations.

'I will not benefit from the seed of Avraham' - he is forbidden from Yisraelim, and permitted from nations.

'I will not benefit from Yisraelim', he buys [from a Yisrael] for more [than the standard price], and sells for less;

[If one vowed] 'that Yisraelim will not benefit from me', he buys [from a Yisrael] for less, and sells for more, if they agree to [do so for] him.

'I will not benefit from [Yisrael], and not them from me', he can benefit [do commerce only] with Nochrim.

(Gemara) Question: (Why are all Nochrim permitted in the Reisha?) Is not Yishmael included in 'the seed of Avraham'?!

Answer: [Indeed, he is not -] "Ki v'Yitzchak Yikarei Lecha Zara."

Question: Is Esav not included in the seed of Yitzchak?!

Answer (R. Yudan bar Shalom): [Indeed, he is not -] "v'Yitzchak 'Yikarei Lecha Zara]", but not all of Yitzchak.

(Rav Huna): The letter 'Beis' [in v'Yitzchak, its Gematriya is] two. It hints to a son who will inherit two worlds, this world and the world to come. (He is called the seed of Yitzchak.)

(R. Gershom citing R. Acha): (Hash-m told Avraham that his seed will be like the stars.) "Darach Kochav mi'Yakov" - from whom did a star traverse, and it will stand up? From Yakov.

(R. Acha citing Rav Huna): In the future, Esav ha'Rasha will cover himself with his Talis and sit with the Tzadikim in Gan Eden in the future;

Hash-m will drag him and expel him from there.

What is the source? "Im Tagbi'ah ka'Nesher v'Im Bein Kochavim Sim Kinecha mi'Sham Oridcha Ne'um Hash-m";

Kochavim refers only to Tzadikim, like it says "u'Matzdkei ha'Rabim ka'Kochavim l'Olam va'Ed."